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What are config servers in MongoDB?

What are config servers in MongoDB?

The config servers also store Authentication configuration information such as Role-Based Access Control or internal authentication settings for the cluster. MongoDB also uses the config servers to manage distributed locks. Each sharded cluster must have its own config servers.

What is MongoDB Sharded cluster?

A MongoDB sharded cluster consists of the following components: shard: Each shard contains a subset of the sharded data. As of MongoDB 3.6, shards must be deployed as a replica set. mongos: The mongos acts as a query router, providing an interface between client applications and the sharded cluster.

Where is etc Mongod conf?

Configuration File

Platform Method Configuration File
Linux apt , yum , or zypper Package Manager /etc/mongod.conf
macOS brew Package Manager /usr/local/etc/mongod.conf (on Intel processors), or /opt/homebrew/etc/mongod.conf (on Apple M1 processors )
Windows MSI Installer \bin\mongod.cfg

What happens when only one configuration server is out of 3?

The MongoDB documentation on Config Servers says: “If one or two config servers become unavailable, the cluster’s metadata becomes read only. You can still read and write data from the shards, but no chunk migrations or splits will occur until all three servers are available.”

How does MongoDB Sharding work?

MongoDB uses the shard key to distribute a collection’s documents across shards. MongoDB splits the data into “chunks”, by dividing the span of shard key values into non-overlapping ranges. MongoDB then attempts to distribute those chunks evenly among the shards in the cluster.

What is a daemon process for MongoDB?

mongod is the primary daemon process for the MongoDB system. It handles data requests, manages data access, and performs background management operations. This document provides a complete overview of all command line options for mongod .

What is chunk in MongoDB?

A chunk consists of a subset of sharded data. Each chunk has a inclusive lower and exclusive upper range based on the shard key. MongoDB splits chunks when they grow beyond the configured chunk size. Both inserts and updates can trigger a chunk split.

What is the difference between sharding and partitioning?

Sharding and partitioning are both about breaking up a large data set into smaller subsets. The difference is that sharding implies the data is spread across multiple computers while partitioning does not. Partitioning is about grouping subsets of data within a single database instance.

What is the difference between sharding and replication?

What is the difference between replication and sharding? Replication: The primary server node copies data onto secondary server nodes. This can help increase data availability and act as a backup, in case if the primary server fails. Sharding: Handles horizontal scaling across servers using a shard key.

What is PID in MongoDB?

PID stands for Process IDentifier.

How do I change the config file in MongoDB?

If you’re on windows and are wondering how to edit the config file.

  1. Open the file.
  2. Edit the cfg file however you want.
  3. Save as and save it to another folder somewhere else.
  4. Copy/cut and past the file back into the bin folder and accept admin permission.

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